Table 1. The clinical characteristics of patients (n=273).
| Characteristic | N (%) |
|---|---|
| Age, years | 53.9±10.6 (27-80) |
| ≥70 | 18 (6.59) |
| <70 | 255 (93.41) |
| Gender | |
| Male | 91 (33.33) |
| Female | 182 (66.67) |
| Smoking history | |
| Yes | 216 (79.12) |
| No | 57 (20.88) |
| Tumor size | |
| >6mm | 16 (5.86) |
| 6-8mm | 47 (17.22) |
| <8mm | 210 (76.92) |
| Histologic types | |
| Benign | 65 (23.81) |
| AAH | 23 (8.42) |
| Inflammatory cell infiltration | 19 (6.96) |
| Hyperplasia of fibrous tissue | 15 (5.49) |
| Granulomas | 5 (1.83) |
| Hamartomas | 3 (1.10) |
| Malignant | 208 (76.19) |
| AIS | 130 (47.62) |
| MIA | 23 (8.42) |
| IA | 55 (20.15) |
| Increased serum tumor marker | |
| CEA | 4 (1.47) |
| CYFRA 21-1 | 58 (21.25) |
CEA: carcinoembryonic antigen; CYFRA 21-1: cytokeratin 19 fragments, AAH: atypical adenomatous hyperplasia; AIS: adenocarcinoma in situ; MIA: minimally invasive adenocarcinoma; IA: invasive adenocarcinoma.